Blogs have no intrinsic advantage over any other form of site, and specific software such as WordPress has equally as much advantage - zero! The reason blogs are often successful in SEO terms, and can be a useful addition to a site are twofold:
1) They provide a constant stream of fresh, unique content, which is not only good in it's own right, but helps to gain incoming links.
2) The "blogosphere" is highly linked together - blogrolls, interlinked posts and the like will get you many incoming links.
Of course, there's no reason why any site can't have fresh unique content, and get plenty of incoming links.
To answer your specific questions:
1) Absolutely none - the same reasons as I replied in your other thread.
2) Correct. Duplicate content is absolutely useless for SEO, whether it occurs on a blog, or anywhere else within your site.
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